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18 Delphini b
Extrasolar planet List of extrasolar planets
300px
Artist's conception of 18 Delphini b, as a "Super-Jupiter".
Parent star

<tr> <td colspan="2">Star</td> <td>18 Delphini</td></tr><tr> <td colspan="2">Constellation</td> <td>Delphinus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>20h 58m 26s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+10° 50′ 21″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.52</td></tr><tr><td colspan="2">Distance</td><td>238 ± 11 ly
(73.1 ± 3.5 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.6 AU
(390 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>35 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>2.4 AU
(360 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.8 AU
(420 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.08 ± 0.01</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>993.3 ± 3.2 d
(2.719 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>166.1 ± 6.5°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451672 ± 18 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>10.3 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>19 February 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Sato et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Okayama Planet
Search Program

Template:Country data Japan</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</td></tr>

Other designations
HD 199665 b, HIP 103527 b, HR 8030 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

18 Delphini b or 18 Del b is a very massive and dense planet approximately 238 light-years away in the constellation of Delphinus. The planet orbits the yellow giant star 18 Delphini. The planet has a minimum mass of 10.3 MJ and a period of 993 days. This planet was discovered on February 19, 2008 by Sato.[1]

File:18 Del b rv.pdf

See also Edit

References Edit

  1. 1.0 1.1 1.2 (2008). Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Delphini, ξ Aquilae and HD 81688. Publications of the Astronomical Society of Japan 60 (3): 539–550.

External linksEdit

  • Script error – lists data about the star.


Coordinates: Sky map 20h 58m 26s, +10° 50′ 21″

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